the flash of light in the sky when electricity passes between clouds or between a cloud and the ground

14.

to bump into another mass with force

17.

a sudden jerk or bump

18.

flat, open grasslands

Down

1.

tornado cloud that is wide at the top and narrow where it touches the ground

2.

a trembling or shaking of the ground caused by movements far below the earth's surface

5.

moving in waves or with a smooth, wavy motion

6.

having a sharp, pointed edge or outline

7.

a lifting or upward movement of the earth's crust

10.

rotating columns of air accompanied by whirling funnel-shaped downspouts

13.

serious or extreme in nature

15.

the striking of one body against another

16.

the remains of something broken or destroyed

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